[CI] Delete Apps plugin milestone worfklow

Github action is named strangely in UI. Deleting and then re-adding in subsequent commit to fix display name.

.github/workflows/apps-plugin-milestone.yml

@@ -1,74 +0,0 @@
-name: Apps Plugin (Milestone..)
-
-on:
-  workflow_dispatch:
-    inputs:
-      milestoneVersion:
-        description: "Milestone version (ex: '-M1')"
-        required: true
-
-env:
-  MAVEN_THREADS: '-T 0.5C'
-
-jobs:
-  build:
-    if: ${{ github.repository == 'spring-cloud/stream-applications' }}
-    runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: spring-cloud-dataflow-apps-plugin
-    steps:
-    - uses: actions/checkout@v2
-        - uses: actions/setup-java@v3
-          with:
-            java-version: 17
-            distribution: temurin
-    - uses: jvalkeal/setup-maven@v1
-      with:
-        maven-version: 3.8.8
-        maven-mirror: 'https://dlcdn.apache.org/maven/maven-3/'
-    - uses: jfrog/setup-jfrog-cli@v1
-      with:
-        version: 1.46.4
-      env:
-        JF_ARTIFACTORY_SPRING: ${{ secrets.JF_ARTIFACTORY_SPRING }}
-    - uses: actions/cache@v2
-      with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-m2-
-    - name: Configure JFrog Cli
-      run: |
-        jfrog rt mvnc \
-          --server-id-resolve=repo.spring.io \
-          --server-id-deploy=repo.spring.io \
-          --repo-resolve-releases=libs-milestone \
-          --repo-resolve-snapshots=libs-snapshot \
-          --repo-deploy-releases=libs-milestone-local \
-          --repo-deploy-snapshots=libs-snapshot-local
-        echo JFROG_CLI_BUILD_NAME=spring-cloud-dataflow-apps-plugin-main-milestone >> $GITHUB_ENV
-        echo JFROG_CLI_BUILD_NUMBER=$GITHUB_RUN_NUMBER >> $GITHUB_ENV
-    - name: Build and Publish
-      run: |
-        jfrog rt mvn build-helper:parse-version versions:set \
-          -gs settings.xml \
-          -Pstagingmilestone \
-          -DprocessAllModules=true \
-          -DgenerateBackupPoms=false \
-          -Dartifactory.publish.artifacts=false \
-          -DnewVersion='${parsedVersion.majorVersion}.${parsedVersion.minorVersion}.${parsedVersion.incrementalVersion}-'${milestoneVersion} \
-          -B
-        jfrog rt build-clean
-        jfrog rt mvn -gs settings.xml -Pstagingmilestone,full,deploymentfiles -B install -DskipTests
-        jfrog rt build-publish
-        echo spring_cloud_dataflow_apps_plugin_version=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout) >> $GITHUB_ENV
-    - name: Tag Release
-      uses: jvalkeal/build-zoo-handler@v0.0.4
-      with:
-        tag-release-branch: ${{ env.spring_cloud_dataflow_apps_plugin_version }}
-        tag-release-tag: ${{ env.spring_cloud_dataflow_apps_plugin_version }}
-        tag-release-tag-prefix: v
-    - name: Clean cache
-      run: |
-        find ~/.m2/repository -type d -name '*SNAPSHOT' | xargs rm -fr